Dear Greg,
There's no way to tell by the HTTP header whether a page includes
frames. However, look inside the HTML of the page. If you see any
<FRAMESET> elements, the page contains frames.
See <URL: http://www.htmlhelp.com/reference/html40/frames/ > for more
info, or check out my Frames Free! Ribbon Campaign and WebRing link
below.
Sincerely,
Israel Steinmetz
RingMaster, Frames Free! Ribbon Campaign and WebRing
http://www.noframes.org/
P.S: Other relevant WebRings are at <URL:
http://www.noframes.org/webrings/ >. These include the Golden (X)HTML
Resources WebRing and the Valid (X)HTML Webring.